On Wednesday, the officer reported that a white man in a dark pickup truck fired shots at him, causing his patrol car to spin around, strike a tree and catch fire. The officer said he returned fire.

Police conducted an intensive search with officers from other law enforcement agencies, firefighters, police dogs and a Massachusetts State Police helicopter.

Also on Wednesday, somebody made a threatening call to a local middle school. City schools were locked down for the day and were closed all day Thursday. Police don’t know if that threat and the cruiser incident are related.

Millis is a town of about 8,000 people located about 25 miles southwest of Boston.